A Practical Guide to Fedora™ and Red Hat® Enterprise Linux®

27. Programming the Bourne Again Shell

In This Chapter

Control Structures 971

File Descriptors 1003

Parameters and Variables 1006

Array Variables 1006

Locality of Variables 1008

Special Parameters 1010

Positional Parameters 1012

Builtin Commands 1018

Expressions 1032

Shell Programs 1040

A Recursive Shell Script 1041

The quiz Shell Script 1044

Objectives

After reading this chapter you should be able to:

• Use control structures to add decision making and repetition in scripts

• Handle input and output of scripts

• Use local and environment variables

• Evaluate the value of variables

• Use bash builtin commands to call other scripts inline, trap signals, and kill processes

• Use arithmetic and logical expressions

• List standard programming ...